After being a prominent campaigner for her mother, Hillary Clinton, five years ago, Chelsea Clinton’s absence from the current presidential campaign is conspicuous. But sources tell us she isn’t disillusioned with President Obama, but that her contract with NBC News “prevents her from participating in the campaign.” Between 2007 and the end of the 2008 primaries, Chelsea played a role in her mother’s run for president, appearing at more than 100 college campuses before introducing Hillary at the August 2008 Democratic National Convention. This year, Chelsea attended both the DNC and the RNC conventions, but took a more neutral role. The former first daughter moderated a panel about millennials — 18- to 29-year-olds — at the RNC in Tampa in August. She then cheered on her father at the DNC in September and moderated a panel for the National Journal about the youth vote. Another source told us, “Because of her work with NBC, Chelsea has been participating on both sides of the process.”